I try to listen out for subtle clues. I also never get bored watching it. So you're saying there is a book about Primer? I'll have to try find it. Already on my to-do list is to get the book about Inception. You might be interested in /r/PrimerMovie

The small town called Kaingaroa, New Zealand, that my father grew up in. It was a forestry town. When we took a detour on a family trip we drove through. Run down houses, broken windows, overgrown lawns. My dads old house was in pretty bad shape. We were all saddened by it.